68 



Descriptions of New Species of Fossils 



portions of the adjacent subradials, the basal portion of the radials 

 and upper part of the basal plates, are distinctly flattened or some- 

 times slightly concave ; and in like manner the areas formed by the 

 lateral portions of adjacent radial plates and the upper part of the sub- 

 radial are distinctly flattened. The pentagonal basal plate higher than 

 wide, the other two wider than high. Subradials with the pentagonal 

 forms a little higher than wide and the others about equal in height 

 and width. Radials fully one-third wider than high, with a narrow 

 cicatrix upon the upper margin for the attachment of the brachial 

 plate, which occupies scarcely one-third of the width of the plate 

 below. First arm plate quadrangular, above which their character 

 is unknown. Surface finely granulose. Column and arms unknown. 

 Height of calyx 12 mm. 



This species in its external form bears much resemblance to Cya- 

 thocrinus Polyxo, but it is less robust, more slender and more dis- 

 tinctly pentangular in the lower part, while the column attachment 

 is proportionally smaller. Compared with the young of that species 

 the basal plates are distinctly higher, and the same is true of the 

 subradials ; but a marked difference in the structure is shown in the 

 number and form of the basal plates, — G. Polyxo having five short 

 broad plates, while this species has three basals, two of these hex- 

 agonal and about as high as wide, and one pentagonal plate on the 

 anal side which is much higher than wide. 



Cod ASTER (StEPHAjN^OCRINUS ?) PULCHELLtJS. 



Cadaster pulcJieUus Miller and Dyer. Contributions to Palaeontology, Journal 

 of the Cincinnati Society of Natural Aistory, April, 1878.* 



Body obconical, triangular below, becoming obtusely pentagonal 

 above, the angles coinciding with the ambulacral areas ; the exterior 

 surface between these being flat or slightly concave in the upper 

 part. The basal plates constitute a little more than one-third the 

 entire height of the body : plates of the second range much larger 

 than the basal, and deeply indented on their upper margin for the 

 reception of the ambulacra : plates of the third range extremely 

 minute except on the anal ? side, where the terminal plate broadly 

 truncates the upper sides of the two adjacent plates of the second 

 range. Central aperture conspicuous, pentalobate. Surface ob- 

 scurely striated. 



In the specimens examined, the minute j^lates covering the central 



